def cache_file_to_be_served(tmp, checkpoint, download_id, format=None, filename=None, expiry=10*60*60):
    """
    tmp can be either either a path to a tempfile or a StringIO
    (the APIs for tempfiles vs StringIO are unfortunately... not similar)
    """
    if checkpoint:
        format = Format.from_format(format)
        try:
            filename = unidecode(filename)
        except Exception:
            pass

        escaped_filename = escape_quotes('%s.%s' % (filename, format.extension))

        payload = tmp.payload
        expose_cached_download(payload, expiry, ".{}".format(format.extension),
                        mimetype=format.mimetype,
                        content_disposition='attachment; filename="%s"' % escaped_filename,
                        extras={'X-CommCareHQ-Export-Token': checkpoint.get_id},
                        download_id=download_id)
        tmp.delete()
    else:
        # this just gives you a link saying there wasn't anything there
        expose_cached_download("Sorry, there wasn't any data.", expiry, None,
                        content_disposition="",
                        mimetype="text/html",
                        download_id=download_id).save(expiry)

def build_application_zip(include_multimedia_files, include_index_files, app,
                          download_id, build_profile_id=None, compress_zip=False, filename="commcare.zip"):
    from corehq.apps.hqmedia.views import iter_app_files

    DownloadBase.set_progress(build_application_zip, 0, 100)

    errors = []
    compression = zipfile.ZIP_DEFLATED if compress_zip else zipfile.ZIP_STORED

    use_transfer = settings.SHARED_DRIVE_CONF.transfer_enabled
    if use_transfer:
        fpath = os.path.join(settings.SHARED_DRIVE_CONF.transfer_dir, "{}{}{}{}{}".format(
            app._id,
            'mm' if include_multimedia_files else '',
            'ccz' if include_index_files else '',
            app.version,
            build_profile_id
        ))
    else:
        _, fpath = tempfile.mkstemp()

    if not (os.path.isfile(fpath) and use_transfer):  # Don't rebuild the file if it is already there
        files, errors = iter_app_files(app, include_multimedia_files, include_index_files, build_profile_id)
        with open(fpath, 'wb') as tmp:
            with zipfile.ZipFile(tmp, "w") as z:
                for path, data in files:
                    # don't compress multimedia files
                    extension = os.path.splitext(path)[1]
                    file_compression = zipfile.ZIP_STORED if extension in MULTIMEDIA_EXTENSIONS else compression
                    z.writestr(path, data, file_compression)

    common_kwargs = dict(
        mimetype='application/zip' if compress_zip else 'application/x-zip-compressed',
        content_disposition='attachment; filename="{fname}"'.format(fname=filename),
        download_id=download_id,
    )
    if use_transfer:
        expose_file_download(
            fpath,
            use_transfer=use_transfer,
            **common_kwargs
        )
    else:
        expose_cached_download(
            FileWrapper(open(fpath)),
            expiry=(1 * 60 * 60),
            file_extension=file_extention_from_filename(filename),
            **common_kwargs
        )

    DownloadBase.set_progress(build_application_zip, 100, 100)
    return {
        "errors": errors,
    }

def prepare_download(download_id, payload_func, content_disposition,
                     content_type, expiry=10*60*60):
    """
    payload_func should be an instance of SerializableFunction, and can return
    either a string or a FileWrapper object
    """
    try:
        payload = payload_func(process=prepare_download)
    except TypeError:
        payload = payload_func()
    expose_cached_download(payload, expiry, None, mimetype=content_type,
                           content_disposition=content_disposition,
                           download_id=download_id)

def export_async(custom_export, download_id, format=None, filename=None, **kwargs):
    try:
        export_files = custom_export.get_export_files(format=format, process=export_async, **kwargs)
    except SchemaMismatchException, e:
        # fire off a delayed force update to prevent this from happening again
        rebuild_schemas.delay(custom_export.index)
        expiry = 10 * 60 * 60
        expose_cached_download(
            "Sorry, the export failed for %s, please try again later" % custom_export._id,
            expiry,
            None,
            content_disposition="",
            mimetype="text/html",
            download_id=download_id,
        ).save(expiry)

    def post(self, request):
        replace = 'replace' in request.POST

        file_ref = expose_cached_download(
            request.file.read(),
            file_extension=file_extention_from_filename(request.file.name),
            expiry=1*60*60,
        )

        # catch basic validation in the synchronous UI
        try:
            validate_fixture_file_format(file_ref.get_filename())
        except FixtureUploadError as e:
            messages.error(
                request, _('Please fix the following formatting issues in your Excel file: %s') %
                '<ul><li>{}</li></ul>'.format('</li><li>'.join(e.errors)),
                extra_tags='html'
            )
            return HttpResponseRedirect(fixtures_home(self.domain))

        # hand off to async
        task = fixture_upload_async.delay(
            self.domain,
            file_ref.download_id,
            replace,
        )
        file_ref.set_task(task)
        return HttpResponseRedirect(
            reverse(
                FixtureUploadStatusView.urlname,
                args=[self.domain, file_ref.download_id]
            )
        )

    def post(self, request, *args, **kwargs):
        upload = request.FILES.get('bulk_upload_file')
        if not upload:
            messages.error(request, _('no file uploaded'))
            return self.get(request, *args, **kwargs)
        if not args:
            messages.error(request, _('no domain specified'))
            return self.get(request, *args, **kwargs)

        domain = args[0]

        # stash this in soil to make it easier to pass to celery
        file_ref = expose_cached_download(upload.read(),
                                   expiry=1*60*60)
        task = import_locations_async.delay(
            domain,
            file_ref.download_id,
        )
        file_ref.set_task(task)
        return HttpResponseRedirect(
            reverse(
                LocationImportStatusView.urlname,
                args=[domain, file_ref.download_id]
            )
        )

    def post(self, request, *args, **kwargs):
        form_ids = self.get_xform_ids(request)
        if not self.request.can_access_all_locations:
            inaccessible_forms_accessed = self.inaccessible_forms_accessed(
                form_ids, self.domain, request.couch_user)
            if inaccessible_forms_accessed:
                return HttpResponseBadRequest(
                    "Inaccessible forms accessed. Id(s): %s " % ','.join(inaccessible_forms_accessed))

        mode = self.request.POST.get('mode')
        task_ref = expose_cached_download(payload=None, expiry=1*60*60, file_extension=None)
        task = bulk_form_management_async.delay(
            mode,
            self.domain,
            self.request.couch_user,
            form_ids
        )
        task_ref.set_task(task)

        return HttpResponseRedirect(
            reverse(
                XFormManagementStatusView.urlname,
                args=[self.domain, mode, task_ref.download_id]
            )
        )

    def process_upload(self):
        if hasattr(self.uploaded_file, 'temporary_file_path') and settings.SHARED_DRIVE_CONF.temp_dir:
            processing_id = uuid.uuid4().hex
            path = settings.SHARED_DRIVE_CONF.get_temp_file(suffix='.upload')
            shutil.move(self.uploaded_file.temporary_file_path(), path)
            status = BulkMultimediaStatusCacheNfs(processing_id, path)
            status.save()
        else:
            self.uploaded_file.file.seek(0)
            saved_file = expose_cached_download(
                self.uploaded_file.file.read(),
                expiry=BulkMultimediaStatusCache.cache_expiry,
                file_extension=file_extention_from_filename(self.uploaded_file.name),
            )
            processing_id = saved_file.download_id
            status = BulkMultimediaStatusCache(processing_id)
            status.save()

        process_bulk_upload_zip.delay(processing_id, self.domain, self.app_id,
                                      username=self.username,
                                      share_media=self.share_media,
                                      license_name=self.license_used,
                                      author=self.author,
                                      attribution_notes=self.attribution_notes)
        return status.get_response()

def populate_export_download_task(export_instances, filters, download_id, filename=None, expiry=10 * 60 * 60):
    export_file = get_export_file(export_instances, filters)

    file_format = Format.from_format(export_file.format)
    filename = filename or export_instances[0].name
    escaped_filename = escape_quotes('%s.%s' % (filename, file_format.extension))

    payload = export_file.file.payload
    expose_cached_download(
        payload,
        expiry,
        ".{}".format(file_format.extension),
        mimetype=file_format.mimetype,
        content_disposition='attachment; filename="%s"' % escaped_filename,
        download_id=download_id,
    )
    export_file.file.delete()

    def post(self, request, *args, **kwargs):
        upload = request.FILES.get("bulk_upload_file")
        """View's dispatch method automatically calls this"""
        try:
            self.workbook = WorkbookJSONReader(upload)
        except InvalidFileException:
            try:
                csv.DictReader(io.StringIO(upload.read().decode("ascii"), newline=None))
                return HttpResponseBadRequest(
                    "CommCare HQ no longer supports CSV upload. "
                    "Please convert to Excel 2007 or higher (.xlsx) "
                    "and try again."
                )
            except UnicodeDecodeError:
                return HttpResponseBadRequest("Unrecognized format")
        except JSONReaderError as e:
            messages.error(request, "Your upload was unsuccessful. %s" % e.message)
            return self.get(request, *args, **kwargs)
        except HeaderValueError as e:
            return HttpResponseBadRequest("Upload encountered a data type error: %s" % e.message)

        try:
            self.user_specs = self.workbook.get_worksheet(title="users")
        except WorksheetNotFound:
            try:
                self.user_specs = self.workbook.get_worksheet()
            except WorksheetNotFound:
                return HttpResponseBadRequest("Workbook has no worksheets")

        try:
            self.group_specs = self.workbook.get_worksheet(title="groups")
        except WorksheetNotFound:
            self.group_specs = []

        self.location_specs = []
        if Domain.get_by_name(self.domain).commtrack_enabled:
            try:
                self.location_specs = self.workbook.get_worksheet(title="locations")
            except WorksheetNotFound:
                # if there is no sheet for locations (since this was added
                # later and is optional) we don't error
                pass

        try:
            check_headers(self.user_specs)
        except UserUploadError as e:
            return HttpResponseBadRequest(e)

        task_ref = expose_cached_download(None, expiry=1 * 60 * 60)
        task = bulk_upload_async.delay(
            self.domain, list(self.user_specs), list(self.group_specs), list(self.location_specs)
        )
        task_ref.set_task(task)
        return HttpResponseRedirect(reverse(UserUploadStatusView.urlname, args=[self.domain, task_ref.download_id]))

def export_async(custom_export, download_id, format=None, filename=None, **kwargs):
    try:
        export_files = custom_export.get_export_files(format=format, process=export_async, **kwargs)
    except SchemaMismatchException as e:
        # fire off a delayed force update to prevent this from happening again
        rebuild_schemas.delay(custom_export.index)
        expiry = 10*60*60
        expose_cached_download(
            "Sorry, the export failed for %s, please try again later" % custom_export._id,
            expiry,
            None,
            content_disposition="",
            mimetype="text/html",
            download_id=download_id
        ).save(expiry)
    else:
        if export_files:
            if export_files.format is not None:
                format = export_files.format
            if not filename:
                filename = custom_export.name
            return cache_file_to_be_served(export_files.file, export_files.checkpoint, download_id, format, filename)
        else:
            return cache_file_to_be_served(None, None, download_id, format, filename)

    def _cache_file(request, domain, upload):
        """Stash in soil for ten hours to make it easier to pass to celery

        :returns: `LocationImportView.Ref` object that can be identified
        with `isinstance(rval, LocationImportView.Ref)` or an HTTP
        response generated by `lock_locations` (and guaranteed not to be
        `LocationImportView.Ref`) if the lock could not be acquired.
        """
        TEN_HOURS = 10 * 60 * 60
        file_ref = expose_cached_download(
            upload.read(),
            expiry=TEN_HOURS,
            file_extension=file_extention_from_filename(upload.name),
        )
        # put the file_ref.download_id in cache to lookup from elsewhere
        cache.set(import_locations_task_key(domain), file_ref.download_id, TEN_HOURS)
        return LocationImportView.Ref(file_ref)

    def post(self, request, *args, **kwargs):
        form_ids_or_query_string = self.get_form_ids_or_query_string(request)
        mode = self.request.POST.get('mode')
        task_ref = expose_cached_download(payload=None, expiry=1*60*60, file_extension=None)
        task = bulk_form_management_async.delay(
            mode,
            self.domain,
            self.request.couch_user,
            form_ids_or_query_string
        )
        task_ref.set_task(task)

        return HttpResponseRedirect(
            reverse(
                XFormManagementStatusView.urlname,
                args=[self.domain, mode, task_ref.download_id]
            )
        )

def prepare_fixture_download(table_ids, domain, task, download_id):
    """Prepare fixture data for Excel download
    """
    data_types_book, excel_sheets = _prepare_fixture(table_ids, domain, task=task)

    header_groups = [("types", excel_sheets["types"]["headers"])]
    value_groups = [("types", excel_sheets["types"]["rows"])]
    for data_type in data_types_book:
        header_groups.append((data_type.tag, excel_sheets[data_type.tag]["headers"]))
        value_groups.append((data_type.tag, excel_sheets[data_type.tag]["rows"]))

    file = StringIO()
    format = Format.XLS_2007
    export_raw(tuple(header_groups), tuple(value_groups), file, format)
    return expose_cached_download(
        file.getvalue(),
        60 * 60 * 2,
        mimetype=Format.from_format(format).mimetype,
        content_disposition='attachment; filename="%s_fixtures.xlsx"' % domain,
        download_id=download_id,
    )

def excel_config(request, domain):
    """
    Step one of three.

    This is the initial post when the user uploads the excel file

    named_columns:
        Whether or not the first row of the excel sheet contains
        header strings for the columns. This defaults to True and
        should potentially not be an option as it is always used
        due to how important it is to see column headers
        in the rest of the importer.
    """
    if request.method != 'POST':
        return HttpResponseRedirect(base.ImportCases.get_url(domain=domain))

    if not request.FILES:
        return render_error(request, domain, 'Please choose an Excel file to import.')

    named_columns = request.POST.get('named_columns') == "on"
    uploaded_file_handle = request.FILES['file']

    extension = os.path.splitext(uploaded_file_handle.name)[1][1:].strip().lower()

    # NOTE: We may not always be able to reference files from subsequent
    # views if your worker changes, so we have to store it elsewhere
    # using the soil framework.

    if extension not in importer_util.ExcelFile.ALLOWED_EXTENSIONS:
        return render_error(request, domain,
                            'The Excel file you chose could not be processed. '
                            'Please check that it is saved as a Microsoft '
                            'Excel 97/2000 .xls file.')

    # stash content in the default storage for subsequent views
    file_ref = expose_cached_download(
        uploaded_file_handle.read(),
        expiry=1*60*60,
        file_extension=file_extention_from_filename(uploaded_file_handle.name),
    )
    request.session[EXCEL_SESSION_ID] = file_ref.download_id
    spreadsheet = importer_util.get_spreadsheet(file_ref, named_columns)

    if not spreadsheet:
        return _spreadsheet_expired(request, domain)

    columns = spreadsheet.get_header_columns()
    row_count = spreadsheet.get_num_rows()

    if row_count == 0:
        return render_error(request, domain,
                            'Your spreadsheet is empty. '
                            'Please try again with a different spreadsheet.')

    case_types_from_apps = []
    # load types from all modules
    for row in ApplicationBase.view(
        'app_manager/types_by_module',
        reduce=True,
        group=True,
        startkey=[domain],
        endkey=[domain, {}]
    ).all():
        if not row['key'][1] in case_types_from_apps:
            case_types_from_apps.append(row['key'][1])

    case_types_from_cases = get_case_types_for_domain(domain)
    # for this we just want cases that have data but aren't being used anymore
    case_types_from_cases = filter(lambda x: x not in case_types_from_apps, case_types_from_cases)

    if len(case_types_from_apps) == 0 and len(case_types_from_cases) == 0:
        return render_error(
            request,
            domain,
            'No cases have been submitted to this domain and there are no '
            'applications yet. You cannot import case details from an Excel '
            'file until you have existing cases or applications.'
        )

    return render(
        request,
        "importer/excel_config.html", {
            'named_columns': named_columns,
            'columns': columns,
            'case_types_from_cases': case_types_from_cases,
            'case_types_from_apps': case_types_from_apps,
            'domain': domain,
            'report': {
                'name': 'Import: Configuration'
            },
            'slug': base.ImportCases.slug
        }
    )

#.........这里部分代码省略.........
        form_info = {
            "form": form,
            "attachments": list(),
            "name": form["form"].get("@name", "unknown form"),
            "user": meta.get("username", "unknown_user"),
            "cases": cases,
            "id": form["_id"],
        }
        for k, v in form["_attachments"].iteritems():
            if v["content_type"] == "text/xml":
                continue
            try:
                question_id = unicode(u"-".join(find_question_id(form["form"], k)))
            except TypeError:
                question_id = unicode(u"unknown" + unicode(unknown_number))
                unknown_number += 1

            if not properties or question_id in properties:
                extension = unicode(os.path.splitext(k)[1])
                form_info["attachments"].append(
                    {
                        "size": v["length"],
                        "name": k,
                        "question_id": question_id,
                        "extension": extension,
                        "timestamp": parse(form["received_on"]).timetuple(),
                    }
                )

        return form_info

    key = [domain, app_id, xmlns]
    form_ids = {
        f["id"]
        for f in XFormInstance.get_db().view(
            "attachments/attachments", start_key=key + [startdate], end_key=key + [enddate, {}], reduce=False
        )
    }

    properties = set()
    if export_id:
        schema = FormExportSchema.get(export_id)
        for table in schema.tables:
            # - in question id is replaced by . in excel exports
            properties |= {c.display.replace(".", "-") for c in table.columns}

    if not app_id:
        zip_name = "Unrelated Form"
    forms_info = list()
    for form in iter_docs(XFormInstance.get_db(), form_ids):
        if not zip_name:
            zip_name = unidecode(form["form"].get("@name", "unknown form"))
        forms_info.append(extract_form_info(form, properties))

    num_forms = len(forms_info)
    DownloadBase.set_progress(build_form_multimedia_zip, 0, num_forms)

    # get case names
    case_id_to_name = {c: c for c in case_ids}
    for case in iter_docs(CommCareCase.get_db(), case_ids):
        if case["name"]:
            case_id_to_name[case["_id"]] = case["name"]

    use_transfer = settings.SHARED_DRIVE_CONF.transfer_enabled
    if use_transfer:
        params = "_".join(map(str, [xmlns, startdate, enddate, export_id, num_forms]))
        fname = "{}-{}".format(app_id, hashlib.md5(params).hexdigest())
        fpath = os.path.join(settings.SHARED_DRIVE_CONF.transfer_dir, fname)
    else:
        _, fpath = tempfile.mkstemp()

    if not (os.path.isfile(fpath) and use_transfer):  # Don't rebuild the file if it is already there
        with open(fpath, "wb") as zfile:
            with zipfile.ZipFile(zfile, "w") as z:
                for form_number, form_info in enumerate(forms_info):
                    f = XFormInstance.wrap(form_info["form"])
                    form_info["cases"] = {case_id_to_name[case_id] for case_id in form_info["cases"]}
                    for a in form_info["attachments"]:
                        fname = filename(form_info, a["question_id"], a["extension"])
                        zi = zipfile.ZipInfo(fname, a["timestamp"])
                        z.writestr(zi, f.fetch_attachment(a["name"], stream=True).read(), zipfile.ZIP_STORED)
                    DownloadBase.set_progress(build_form_multimedia_zip, form_number + 1, num_forms)

    common_kwargs = dict(
        mimetype="application/zip",
        content_disposition='attachment; filename="{fname}.zip"'.format(fname=zip_name),
        download_id=download_id,
    )

    if use_transfer:
        expose_file_download(fpath, use_transfer=use_transfer, **common_kwargs)
    else:
        expose_cached_download(
            FileWrapper(open(fpath)),
            expiry=(1 * 60 * 60),
            file_extension=file_extention_from_filename(fpath),
            **common_kwargs
        )

    DownloadBase.set_progress(build_form_multimedia_zip, num_forms, num_forms)

def build_application_zip(include_multimedia_files, include_index_files, app,
                          download_id, build_profile_id=None, compress_zip=False, filename="commcare.zip",
                          download_targeted_version=False):
    from corehq.apps.hqmedia.views import iter_app_files

    DownloadBase.set_progress(build_application_zip, 0, 100)
    initial_progress = 10   # early on indicate something is happening
    file_progress = 50.0    # arbitrarily say building files takes half the total time

    errors = []
    compression = zipfile.ZIP_DEFLATED if compress_zip else zipfile.ZIP_STORED

    use_transfer = settings.SHARED_DRIVE_CONF.transfer_enabled
    if use_transfer:
        fpath = os.path.join(settings.SHARED_DRIVE_CONF.transfer_dir, "{}{}{}{}{}".format(
            app._id,
            'mm' if include_multimedia_files else '',
            'ccz' if include_index_files else '',
            app.version,
            build_profile_id
        ))
        if download_targeted_version:
            fpath += '-targeted'
    else:
        dummy, fpath = tempfile.mkstemp()

    DownloadBase.set_progress(build_application_zip, initial_progress, 100)

    if not (os.path.isfile(fpath) and use_transfer):  # Don't rebuild the file if it is already there
        files, errors, file_count = iter_app_files(
            app, include_multimedia_files, include_index_files, build_profile_id,
            download_targeted_version=download_targeted_version,
        )

        if toggles.CAUTIOUS_MULTIMEDIA.enabled(app.domain):
            manifest = json.dumps({
                'include_multimedia_files': include_multimedia_files,
                'include_index_files': include_index_files,
                'download_id': download_id,
                'build_profile_id': build_profile_id,
                'compress_zip': compress_zip,
                'filename': filename,
                'download_targeted_version': download_targeted_version,
                'app': app.to_json(),
            }, indent=4)
            files = itertools.chain(files, [('manifest.json', manifest)])

        with open(fpath, 'wb') as tmp:
            with zipfile.ZipFile(tmp, "w") as z:
                progress = initial_progress
                for path, data in files:
                    # don't compress multimedia files
                    extension = os.path.splitext(path)[1]
                    file_compression = zipfile.ZIP_STORED if extension in MULTIMEDIA_EXTENSIONS else compression
                    z.writestr(path, data, file_compression)
                    progress += file_progress / file_count
                    DownloadBase.set_progress(build_application_zip, progress, 100)

        # Integrity check that all media files present in media_suite.xml were added to the zip
        if include_multimedia_files and include_index_files and toggles.CAUTIOUS_MULTIMEDIA.enabled(app.domain):
            with open(fpath, 'rb') as tmp:
                with zipfile.ZipFile(tmp, "r") as z:
                    media_suites = [f for f in z.namelist() if re.search(r'\bmedia_suite.xml\b', f)]
                    if len(media_suites) != 1:
                        message = _('Could not identify media_suite.xml in CCZ')
                        errors.append(message)
                    else:
                        with z.open(media_suites[0]) as media_suite:
                            from corehq.apps.app_manager.xform import parse_xml
                            parsed = parse_xml(media_suite.read())
                            resources = {node.text for node in
                                         parsed.findall("media/resource/location[@authority='local']")}
                            names = z.namelist()
                            missing = [r for r in resources if re.sub(r'^\.\/', '', r) not in names]
                            errors += [_('Media file missing from CCZ: {}').format(r) for r in missing]

        if errors:
            os.remove(fpath)
            raise Exception('\t' + '\t'.join(errors))
    else:
        DownloadBase.set_progress(build_application_zip, initial_progress + file_progress, 100)

    common_kwargs = {
        'mimetype': 'application/zip' if compress_zip else 'application/x-zip-compressed',
        'content_disposition': 'attachment; filename="{fname}"'.format(fname=filename),
        'download_id': download_id,
        'expiry': (1 * 60 * 60),
    }
    if use_transfer:
        expose_file_download(
            fpath,
            use_transfer=use_transfer,
            **common_kwargs
        )
    else:
        expose_cached_download(
            FileWrapper(open(fpath, 'rb')),
            file_extension=file_extention_from_filename(filename),
            **common_kwargs
        )
#.........这里部分代码省略.........

def build_application_zip(include_multimedia_files, include_index_files, app,
                          download_id, build_profile_id=None, compress_zip=False, filename="commcare.zip",
                          download_targeted_version=False):
    from corehq.apps.hqmedia.views import iter_app_files

    DownloadBase.set_progress(build_application_zip, 0, 100)
    initial_progress = 10   # early on indicate something is happening
    file_progress = 50.0    # arbitrarily say building files takes half the total time

    errors = []
    compression = zipfile.ZIP_DEFLATED if compress_zip else zipfile.ZIP_STORED

    use_transfer = settings.SHARED_DRIVE_CONF.transfer_enabled
    if use_transfer:
        fpath = os.path.join(settings.SHARED_DRIVE_CONF.transfer_dir, "{}{}{}{}{}".format(
            app._id,
            'mm' if include_multimedia_files else '',
            'ccz' if include_index_files else '',
            app.version,
            build_profile_id
        ))
        if download_targeted_version:
            fpath += '-targeted'
    else:
        _, fpath = tempfile.mkstemp()

    DownloadBase.set_progress(build_application_zip, initial_progress, 100)

    if not (os.path.isfile(fpath) and use_transfer):  # Don't rebuild the file if it is already there
        files, errors, file_count = iter_app_files(
            app, include_multimedia_files, include_index_files, build_profile_id,
            download_targeted_version=download_targeted_version,
        )
        with open(fpath, 'wb') as tmp:
            with zipfile.ZipFile(tmp, "w") as z:
                progress = initial_progress
                for path, data in files:
                    # don't compress multimedia files
                    extension = os.path.splitext(path)[1]
                    file_compression = zipfile.ZIP_STORED if extension in MULTIMEDIA_EXTENSIONS else compression
                    z.writestr(path, data, file_compression)
                    progress += file_progress / file_count
                    DownloadBase.set_progress(build_application_zip, progress, 100)
    else:
        DownloadBase.set_progress(build_application_zip, initial_progress + file_progress, 100)

    common_kwargs = {
        'mimetype': 'application/zip' if compress_zip else 'application/x-zip-compressed',
        'content_disposition': 'attachment; filename="{fname}"'.format(fname=filename),
        'download_id': download_id,
        'expiry': (1 * 60 * 60),
    }
    if use_transfer:
        expose_file_download(
            fpath,
            use_transfer=use_transfer,
            **common_kwargs
        )
    else:
        expose_cached_download(
            FileWrapper(open(fpath, 'rb')),
            file_extension=file_extention_from_filename(filename),
            **common_kwargs
        )

    DownloadBase.set_progress(build_application_zip, 100, 100)
    return {
        "errors": errors,
    }

#.........这里部分代码省略.........
        form_info = {
            'form': form,
            'attachments': list(),
            'name': form['form'].get('@name', 'unknown form'),
            'user': meta.get('username', 'unknown_user'),
            'cases': cases,
            'id': form['_id']
        }
        for k, v in form['_attachments'].iteritems():
            if v['content_type'] == 'text/xml':
                continue
            try:
                question_id = unicode(u'-'.join(find_question_id(form['form'], k)))
            except TypeError:
                question_id = unicode(u'unknown' + unicode(unknown_number))
                unknown_number += 1

            if not properties or question_id in properties:
                extension = unicode(os.path.splitext(k)[1])
                form_info['attachments'].append({
                    'size': v['length'],
                    'name': k,
                    'question_id': question_id,
                    'extension': extension,
                    'timestamp': parse(form['received_on']).timetuple(),
                })

        return form_info

    key = [domain, app_id, xmlns]
    form_ids = {f['id'] for f in XFormInstance.get_db().view("attachments/attachments",
                                                             start_key=key + [startdate],
                                                             end_key=key + [enddate, {}],
                                                             reduce=False)}

    properties = set()
    if export_id:
        schema = FormExportSchema.get(export_id)
        for table in schema.tables:
            # - in question id is replaced by . in excel exports
            properties |= {c.display.replace('.', '-') for c in table.columns}

    if not app_id:
        zip_name = 'Unrelated Form'
    forms_info = list()
    for form in iter_docs(XFormInstance.get_db(), form_ids):
        if not zip_name:
            zip_name = unidecode(form['form'].get('@name', 'unknown form'))
        forms_info.append(extract_form_info(form, properties))

    num_forms = len(forms_info)
    DownloadBase.set_progress(build_form_multimedia_zip, 0, num_forms)

    # get case names
    case_id_to_name = {c: c for c in case_ids}
    for case in iter_docs(CommCareCase.get_db(), case_ids):
        if case['name']:
            case_id_to_name[case['_id']] = case['name']

    use_transfer = settings.SHARED_DRIVE_CONF.transfer_enabled
    if use_transfer:
        params = '_'.join(map(str, [xmlns, startdate, enddate, export_id, num_forms]))
        fname = '{}-{}'.format(app_id, hashlib.md5(params).hexdigest())
        fpath = os.path.join(settings.SHARED_DRIVE_CONF.transfer_dir, fname)
    else:
        _, fpath = tempfile.mkstemp()

    if not (os.path.isfile(fpath) and use_transfer):  # Don't rebuild the file if it is already there
        with open(fpath, 'wb') as zfile:
            with zipfile.ZipFile(zfile, 'w') as z:
                for form_number, form_info in enumerate(forms_info):
                    f = XFormInstance.wrap(form_info['form'])
                    form_info['cases'] = {case_id_to_name[case_id] for case_id in form_info['cases']}
                    for a in form_info['attachments']:
                        fname = filename(form_info, a['question_id'], a['extension'])
                        zi = zipfile.ZipInfo(fname, a['timestamp'])
                        z.writestr(zi, f.fetch_attachment(a['name'], stream=True).read(), zipfile.ZIP_STORED)
                    DownloadBase.set_progress(build_form_multimedia_zip, form_number + 1, num_forms)

    common_kwargs = dict(
        mimetype='application/zip',
        content_disposition='attachment; filename="{fname}.zip"'.format(fname=zip_name),
        download_id=download_id,
    )

    if use_transfer:
        expose_file_download(
            fpath,
            use_transfer=use_transfer,
            **common_kwargs
        )
    else:
        expose_cached_download(
            FileWrapper(open(fpath)),
            expiry=(1 * 60 * 60),
            file_extension=file_extention_from_filename(fpath),
            **common_kwargs
        )

    DownloadBase.set_progress(build_form_multimedia_zip, num_forms, num_forms)